Control valve device arranged for direct or graduated...

Details Control valve device arranged for direct or graduated... Control valve device arranged for direct or graduated...

B - Operations, Transporting

60

T

303/46

B60T 17/00 (2006.01) B60T 15/22 (2006.01)

Patent

CA 1242232

ABSTRACT OF THE DISCLOSURE In a brake control valve device for railway vehicles in which a bias spring acts on the piston stack assembly of the valve device, an additional air reservoir and a differential check valve are arranged to assure proper full service brake pressure, when the control valve device is operated in a direct release mode, thereby overcoming the effect of the bias spring in producing a force balance to cause the piston stack assembly to assume a lap condition before full service brake pressure is achieved. The arrangement has no adverse effect when the control valve device is operated in a gradu- ated release mode.

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